Windshield wiper motor



Feb. 15, 1944. R. J. STANLEY Erm.

WINDSHIELD WIPER MOTOR Filed Aug. 19, 1940 2 Sheets-Sheet 1 LLI S). zo@

wenom //ILLIAM J MAR TERE TECK M FAn/MENU J ETANLEY 5543 J V uwa Feb. l5, 1944. R. J. STANLEY ETAL WINDSHIELD WIPER MOTOR Filed Aug. 19, 1940 2 Sheets-Sheet 2 3 we/nm 'SALLIAM JMAR TERETEEK,

A NDI- 9A Yun/vn .J 5 TA NLE Y @3&1 iam vf @ma drawings, in which latented Feb'. 1944 NT ori-ica wmnsnmLn WIPEB Moron Raymond Joseph Stanley and William John Martersteck, Jackson, Mich., assignors to Townsend F. Beaman, Jackson, Mich., as trustee Application August 19, i940, serial No'. 353.216 comms. (onu-12s) The present invention relates to accessory actuating mechanism for internal combustion engines and more particularly to mechanism for actuating windshield wipersmctuated by oil pressure from the engine lubricating system. The inven tion yconstitutes an embodiment of the windshield wiper mechanism disclbsed in Patent No. 2,191,356, issued to S. A. Snell. and in general has the same objects and accomplishes the same results as the structure disclosed in said patent.

In the aforesaid patent the windshield wiper mechanism includes an. oil pressure actuated motor and an actuating valve therefor which are arranged in an assembly for connection to the oil pump housing of an internal combustion engine. According to the present invention, the motor and its valve are included together in association with the fuel pump and the valve is driven by the moving part of the internal combustion engine employed to actuate the fuel pump. In addition the present invention `includes a novel parking arrangement for insuring the stopping of the movement of the windshield wiper at the end of a stroke. v. v

An object of the present invention is to provide an oil pressure actuated windshield wiper associated'with an internal combustion engine, which operates at a speed timed by a, moving element of the internal combustion engine employed for actuating the fuel pump thereof.A

Another object of the invention is to provide a valve controlled, oil pressure operated motor associated with an internal'co'mbustion engine,

having the valve controlled by the actuating member for the fuel pumpof the engine.

A further object of the invention is to :provide an oil pressure operated Windshield wiper motor having a parking structure comprising a man- Referring particularly to the drawings, the reference character I indicates vtheinternal combustion engine of the automotive vehicle with which the windshield wiper drivenby the mechanism comprising the present invention is associated. The engine `I is provided with a cylinder oil filling pipe 2 having a seat 3 againstl which the conventional fuel pump casting is adapted 1 to be secured.'v Howeverl as disclosed particularly ually settable member automatically movable to l stop the operation of the wiper at the end of a stroke thereof. Y

These and other objects residing in the combination, arrangement and construction of the parts will be apparent from the following specication when taken with the accompanying Fig. 1 is a ,section on the line I-I- of Fig. 2 showing the mechanism of the present invention as associated with an internal combustion engine,

Fig. 2 is a section on the line lI-'II of Fig. 1, Fig. 3 is a section on the line III-'III of Fig. 2,

Fig. 4 is a section on the line IV-IV of Fig. ,2,

invention.

in Fig. 1, there is disposed between the seat 3 and the fuel pumpcasting a. housing i supporting the windshield wiper driving mechanism. The engine I is provided with a cam shaft 6 having a cam 'I thereon in driving relation with a plunger 8 for actuating `the engine fuel pump in the usual manner. In the present invention the plunger 8 is elongated to extend through the housing 5 in order to reach the fuel pump lever 9 to actuate the fuel pump. Therplunger 8 is guided for vertical reciprocation in a xed path andis reciprocated by the cam 1. It is held against the cam 1 `by the resiliency of the fuel pump struct-ure.

Disposed within the housing 5 is a lever I0 pivoted to the housing 5 by a pin II. The lever IIJ hasfa U-shaped end I2 surrounding the plunger 8 asshown in Fig. 2. On opposite sides of the end I2 are'collars I3 afxed to the plunger 8 for oscillating the lever I0 about the pin II as the plunger 8 is reciprocated by the cam l. Curved contact surfaces Ill are provided on the lever IIl for providing a rolling contact with the collars I3. There may be one or two windshield wipers mounted and actuated in the same manner as disclosed in aforesaid patent. The wiper or wipers, which are not shown in the drawings, are actuated by a Bowden wire I5 disclosed particularly in Figs. 1, 3 and 5. The Bowden wire I5 is reciprocated by a piston I6 in a cylinder I1 as shown'in Fig. 3. The piston I6 is reciprocatedby oil from the pressure oil lubricating systemof the internal combustion engine I. Oil from the pressure side of the lubricating systemis con.-4

ductedthrough a port 20 and a distributing valve 2i, the valve 2| being cylindrical in form and journaled in the housing. The active portions of the valve 2I consist of flat sides 2 2, shown particularly in Figs. 2 and 5. As appears most clearly in Fig. 5 oil from the pressure side of the lubrieating system enters through the conduit 20 and in onepositlon thereof, valve ZI directs the oil through a conduit 23 to the lower end of the` cyl,- inder I 'I to move the piston I6 upwardly. At the saine time spent oil in the cylinder Il above the piston. vIl; is forced through a conduitdtothe valve 2l and is directed by the valve 2I through 'sure oil directed against the underside of the piston I6 moves the piston I6 to the upper end of the cylinder I1 to longitudinally move the Bowden wire I to provide the windshield wiper with a stroke in one direction as will be clear by reference to aforesaid patent.

For operation of the windshield wiper, the valve 2| is continuously rotated and for inoperation of the windshield wiper, the valve 2| is maintained motionless. As the valve 2| continues to rotate following the direction of oil under pressure to the lower end of the cylinder I1, it will assume a position in which one of the surfaces 22 thereof will direct pressure oil from the conduit 25 to the conduit 24 communicating with the upper end of the cylinder Il. At the same time the opposite surface 22 of the valve 2| will direct spent oil from beneath the piston I6 through the conduit 23 to the conduit 25 and into the opening 26 from which it is returned to the low pressure side of the lubricating system. Thus the oil passing through the conduit 24 will drive the piston I6 downwardly to move the Bowden wire l5 longitudinally to provide the Wind-- shield wiper with a stroke in the opposite direction. As the valve 2| continues to rotate, the piston I6 will be directed alternately from one end to the other of the cylinder I1 and thus reciprocate the Bowden wire I5 to operatively oscillate the windshield wiper back and forth in the usual manner.

The mechanism for rotating the valve 2| consists of a ratchet wheel 36 afllxed to the valve 2| for rotation therewith and arranged to be rotated by a pawl 3| pivoted by a pin 32 to the lever I0. The pawl 3| and ratchet wheel 3U constitute an overrunning clutch structure. Retrograde movement of the ratchet wheel 30 is prevented by a spring detent 33 and pawl 3| is resiliently urged into operative engagement with the ratchet wheel 30 by a spring 34. As lshown particularly in Fig. 1, the spring 34 is provided with a rounded end 35 which bears against a tail piece 36 of the pawl 3|, angularly disposed with respect to the pawl 3|, as shown most clearly in Fig. 2. Thus as the pawl 3| is moved back and forth under the action of the lever I0 it slides against the rounded end 35 of the spring 34. In its downward movement as viewed in Fig. 1 the pawl 3| engages with the teeth of the ratchet wheel 3I| to provide the same with a predetermined rotation. During the upward movement of the pawl 3| as viewed in Fig. 1 the pawl 3| clicks overv the teeth of the ratchet wheel 30, retrograde movement thereof being prevented by the spring detent 33.

The starting and stopping of the windshield wiper is under the control of a Bowden wire 40 terminating on the dash board or in some convenient place within the body of the automobile with which the wiper is associated. The Bowden wire 40 as shown particularly in Fig. 4 is connected to a plunger 4I which in turn is slidably mounted in a bore 42 in a cap 43 secured to the housing 5 by screws 44. To the inner end of the plunger 4| is pivoted a follower member 45. The follower member 45 is arranged to reciprocate adjacent the tail piece 36 of the pawl 3| under the action of the Bowden wire 40 and the plunger 4|. The plunger 4| is provided with two annular grooves which are axially spaced apart and are arranged to co-act with a spring detent 4 showninl'ig.4andwhichisofthehairpintyps. The spring detent 411s disposedr in a recess 43 in the cap 43 and yieldingly locks the plunger 4I in one of two positions as determined by the annular grooves 46. 'I'hus when the Bowden wire 40 is pushed inwardly to the position shown in Fig. 4, the follower member 45 together with the plunger 4| are yieldingly locked in the inward position by the detent 41 resting in one of the annular grooves 46. When the Bowden wire 45 is pulled outwardly the other annular groove 45 will engage with thespring detent 41 to yieldingly hold the plunger 4| and the follower 45 in outward position. In outward position the en.- larged portion of the follower member 45 is opposite the tail piece 36 of the pawl 3 I.

When the follower member 45 is in its outward position, it is in the path of movement of a pin 43 secured to the inside of the ratchet wheel 35 and movable therewith. As the pin 4 5 moves into contact with the follower member 45, it urges the follower member 45 against the tail piece 36 of the pawl 3| and moves it out of engagement with the ratchet wheel 30 against the action on the spring 34. While the pawl 3| is thus out of engagement with the ratchet wheel 30 it reciprocates idly under the action of the oscillating lever I0 and does not rotate the ratchet wheel 30. Thus the valve 2| remains stationary and the movement of the wiper stops. The pin 46 should be so positioned with respect to the ratchet wheel 30 and the position of the piston I6 that the valve 2|` will be stopped in a position to continuously direct pressure oil against the end of the piston I6 which will have the result of insuring that the wiper blade stops at one end oi' its stroke and also at the same end of the stroke each time.

In Fig. 6 is disclosed another form of starting and stopping structure. In this form of the in' vention the plunger 4| has rigidly connected to it a follower member 45' which acts as a cam to cam the pawl 3| away from engagement with the ratchet wheel 30 by engaging the tail piece 36 of the pawl 3|. Also, the pin 43 is dispensed with. 'I'hus when it is desired to stop the wiper the Bowden wire 40 is actuated to pull the plunger 4I which pulls the follower member 45' which acts as a cam to urge the pawl 3| away from the ratchet wheel 35 and against the action of the spring 34. Conversely to start the wiper a push on the Bowden wire 40 will move the follower member 45' out of contact with the pawl 3| permitting it to be urged by the spring 34 lback into operative engagement with the ratchet wheel 30.

As seen above, by using a pivoted follower 45 actuated by the pin 48 on the ratchet wheel 35, the windshield wiper always stops at the same end of its stroke. By omitting the pin 45 and making the follower 45 rigid with the plunger 4|, the windshield wiper may stop at any point in its stroke.

While an important feature of the invention is the association of the windshield wiper mechanism with the fuel pump operating mechanism, it will be understood that there are features of the invention which are not limited to this association and to this extent it is contemplated that the power for actuating the mechanism may be asuma desire to secure by Letters Patent and claim is:

1. Intermittent drive mechanism comprising a rotating member, ratchet means for rotating said rotating member, means for actuating said ratchet means, manually operated means positionable to be automatically moved to move said ratchet means into inoperative position, and means movable with said rotating member to automatically engage said manually operated means in one position thereof to move said ratchet means to inoperative position. 1

2. Intermittentdrive mechanism comprising a` ratchet wheel, a driving pawl for rotating said ratchet wheel, means 'to actuatesaid driving pawl, resilient means for urging said pawl into operative engagement with said ratchet wheel, manually operated means positionable to be automatically moved to move saiddriving pawl to inopera- Live position, and a pin projecting from said ratchet wheel and movable therewith to engage said manually operated means in one position thereof to move said driving pawl against the action of said resilient means into inoperative 3. Intermittent drive mechanism' comprising a ratchet wheel, a driving pawl for rotating said ratchet wheel. means to actuate said driving pawl,

manually operabie'means positionable to be automatically moved 'to move said driving pawl to inoperative position, and means automatically operable to move said manually operated means in one position thereof to move said driving pawl into inoperative position.

4. Intermittent drive mechanism comprising a ratchet wheel, a driving pawl for rotating said ratchet wheel, means to actuate said driving pawl,

Vmanually operable means positionable to -be automatically moved to move said driving pawl t0 inoperative. position, and means movable with said ratchet wheel toA engage said manually operable means in one position thereof to move said driving pawl into inoperative position.

` 5. Intermittent drive mechanism comprising-a rotating member, means to drive said rotating member, manuallyoperable means positionable to automatically render said driving means inoperative, and means movable with said rotating means to automatically act on said manually operable means to render said driving means inoperable to stop the rotation of said valve at a predetermined position with reference to the position of said rotating member.

RAYMOND JOSEPH STANLEY. WILLIAM JOHN MARTERSTECK. 

